Bureaucrats, dave_user, Administrators
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== Thermal management ==
DAVE Embedded Systems' team is available for any additional information, please contact [mailto:sales@dave.eu sales@dave.eu].
{| style====U"color:#000000; border:solid 2px #73B2C7; background-color:#ededed;font-Boot====At Usize:95%; vertical-Boot level, automatic boot procedure is halted until Tj is smaller than (following temperatures might seem excessively low but they take into account the intrinsic poor precision of the temperature sensor to provide a reasonable safe margin)align:middle;"|[[File:TBD.png|30px]]*80°C for commercial parts*90 for extended commercial and industrial parts|'''Section not completed yet'''*110°C for automotive parts.|}
====Linux kernel====
At Linux level, a more sophisticated protection mechanism is implemented. Please refer to the following sections for more details.
The default temperature thresholds threshold depend on the silicon grade, as follows: *for commercial parts** passive threshold: 85°C** critical threshold: 90°C*for extended commercial and industrial parts** passive threshold: 95°C** critical threshold: 100°C*for automotive parts** passive threshold: 115°C** critical threshold: 120°C. Practically speaking, for DESK-ETRA-L this mechanism makes use of two different thresholds, denoted as <code>trip_point0</code> (also known as ''passive threshold'') and <code>trip_point1</code> (also known as ''critical threshold''.
Practically speaking, for [[DESK-MP1-L | DESK-MP1-L]] this mechanism makes use of one threshold, denoted as <precode>System is too hot. GPU3D will work at 1/64 clock.trip_point0</precode>(also known as ''critical threshold'').
If Tj reaches <code>trip_point1trip_point0</code>, a complete shutdown is triggered:
<pre>
thermal thermal_zone0: cpu-thermal: critical temperature reached(100 C),shutting down
</pre>
By default, temperature thresholds are set up as follows:
*<code>trip_point0</code>: 85°C*<code>trip_point1</code>: 100°C.120°C
Trip point thresholds threshold can be accessed via <code>sysfs</code> interface from user space. The following example shows how to read the values value of the trip pointspoint:
<pre>
root@axeldesk-litemp1:~# cat /sys/devices/virtual/thermal/thermal_zone0/trip_point_0_temp85000root@axel-lite:~# cat /sys/devices/virtual/thermal/thermal_zone0/trip_point_1_temp100000120000
</pre>
This example shows how to set trip points 0 and 1 to 95°C and 100°C respectively:
<pre>
echo 95000 > /sys/class/thermal/thermal_zone0/trip_point_0_temp
</pre>
{{ImportantMessage|text=Please note that
<pre>
root@axeldesk-litemp1:~# cat /sys/class/thermal/thermal_zone0/temp
36676
</pre>
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[[Category:ETRA]] [[Category:ETRA_SBC]]